A method for preparing strong structural cotton yarn

Abstract

The present application is about a method for preparing strong and tough structural cotton yarn, and relates to the field of textile materials. The preparation method comprises: obtaining a natural cotton yarn sample; immersing the natural cotton yarn sample in a glass container filled with an alkaline solution, removing impurities in the natural cotton yarn sample, and obtaining a treated cotton yarn sample, wherein the treated cotton yarn sample retains the central cavity structure of the natural cotton yarn sample; immersing the treated cotton yarn sample in a glass container filled with deionized water, removing the alkaline solution remaining in the treated cotton yarn sample and the impurities not removed in the previous step, and obtaining a washed cotton yarn sample; drying the washed cotton yarn sample to obtain a dried cotton yarn sample; hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample to collapse the central cavity structure of the dried cotton yarn sample, and obtaining a strong and tough structural cotton yarn. The method solves the problem of how to improve the mechanical properties of cotton yarn without blending with other chemical fibers.

Description

Technical Field

[0001] The present application relates to the technical field of textile materials, and in particular to a method for preparing strong structural cotton yarn. Background Art

[0002] Cotton is a cellulose fiber, with a cellulose content of about 95%, and a small amount of soluble sugars, wax, protein, fat, ash and other accompanying substances. Cotton fiber has a flat, ribbon-like, self-curved shape, and an irregular hollow waist-shaped cross-section.

[0003] Cotton fiber is the most widely used natural fiber and occupies an important position in textile raw materials. It is loved by people because of its skin-friendly, soft and good moisture absorption. However, due to the poor mechanical properties of cotton yarn, problems such as yarn breakage often occur during the production and weaving process, which limits the application of cotton yarn in textiles.

[0004] In order to solve the disadvantage of poor mechanical properties of cotton yarn, the common method at present is to sizing and treat cotton yarn or blend it with other chemical fibers. Sizing treatment consumes a lot of raw materials and needs to be desizing after treatment; blending technology can improve the mechanical properties of cotton yarn, but it will affect the feel of the fabric, and the use of chemical fibers will also increase the consumption of non-renewable resources.

[0005] The key to improving the mechanical properties of cotton yarn is to increase the strength of the cotton fibers themselves and enhance the cohesion between the cotton fibers. Summary of the invention

[0006] The purpose of the present application is to provide a method for preparing strong structural cotton yarn to solve the problem of how to improve the mechanical properties of cotton yarn without blending with other chemical fibers.

[0007] To achieve the above purpose, the technical solution adopted in this application is:

[0008] On the one hand, the present application provides a method for preparing a strong structural cotton yarn, comprising:

[0009] S1. Obtain a natural cotton yarn sample, wherein the natural cotton yarn sample has a central cavity structure, and the central cavity structure extends along the axial direction of the natural cotton yarn sample;

[0010] S2, immersing the natural cotton yarn sample in a glass container containing an alkaline solution to remove impurities in the natural cotton yarn sample to obtain a treated cotton yarn sample, wherein the treated cotton yarn sample retains the central cavity structure of the natural cotton yarn sample;

[0011] S3, immersing the treated cotton yarn sample in a glass container filled with deionized water to remove the residual alkaline solution in the treated cotton yarn sample and the impurities that were not removed in step S2, to obtain a washed cotton yarn sample;

[0012] S4, drying the washed cotton yarn sample to obtain a dried cotton yarn sample;

[0013] S5. Hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample to collapse the central cavity structure of the dried cotton yarn sample to obtain a strong and tough structural cotton yarn.

[0014] In a possible implementation, in step S2, the alkaline solution includes at least one or a combination of sodium hydroxide and sodium sulfite.

[0015] In a possible implementation, in step S1, the raw material of the natural cotton yarn sample includes at least one of Xinjiang long-staple cotton, Egyptian cotton, Sea Island cotton, and Upland cotton.

[0016] In a possible implementation, in step S5, hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample includes:

[0017] The dried cotton yarn sample is subjected to flat heat pressing or uniform heat pressing along the radial direction of the dried cotton yarn sample.

[0018] In a possible implementation, in step S5, the hot pressing temperature when hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample is 20-120°C.

[0019] In a possible implementation, in the step S5, the pressure applied when the dried cotton yarn sample is hot-pressed along the radial direction of the dried cotton yarn sample is 0.5-10 MPa.

[0020] In a possible implementation, in step S2, the time for immersing the natural cotton yarn sample in the glass container containing the alkaline solution is 10-100 seconds.

[0021] In a possible implementation, in step S4, the drying temperature for drying the washed cotton yarn sample is 60-150°C.

[0022] On the other hand, the present application further provides a braided wire, which is braided with the strong and tough structural cotton yarn prepared by any of the above methods for preparing the strong and tough structural cotton yarn, comprising:

[0023] A plurality of the strong structural cotton yarns are wound on a spindle of a braiding machine and then braided.

[0024] In a possible implementation, when the plurality of strong structural cotton yarns are wound around a spindle of a braiding machine and then braided, the braiding pitch is 1-9 mm, the braiding speed is 10-150 rpm, and the braided spring diameter is 0.6-0.8 mm.

[0025] The beneficial effects of the technical solution provided by this application include at least:

[0026] The present application uses chemical treatment to remove soluble sugars, waxes, proteins, fats, ash and other impurities in natural cotton yarn. The treated cotton yarn retains the central cavity structure of natural cotton yarn, in which the cellulose nanofibers of the cell walls are arranged neatly. After being treated with hot pressing technology, the central cavity structure of the cotton yarn collapses, and the cell walls are intertwined, and hydrogen bonds are formed between adjacent cellulose nanofibers, thereby improving the mechanical properties of the cotton yarn without blending with other chemical fibers, thereby retaining the original advantages of the cotton yarn.

[0027] Moreover, the braided wire woven from the strong structural cotton yarn can be completed on a braiding machine, the process is easy to adjust, and the thickness and length of the product are highly adjustable.

[0028] In addition, the present application only carries out chemical treatment in the early stage, and the chemicals used are safe and non-toxic, and the whole process is safe and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0030] Figure 1 A schematic flow chart of a method for preparing a strong structural cotton yarn provided by an exemplary embodiment of the present application is shown;

[0031] Figure 2 A schematic diagram showing the structure of cotton fibers of a strong structural cotton yarn provided by an exemplary embodiment of the present application is shown;

[0032] Figure 3 A schematic diagram showing a state of a strong and tough structural cotton yarn during heat pressing provided by an exemplary embodiment of the present application is shown;

[0033] Figure 4 A schematic diagram of the state of a strong structural cotton yarn after hot pressing provided by an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0036] First, a brief introduction is given to the terms involved in the embodiments of the present application:

[0037] Natural cotton yarn refers to yarn made from pure cotton fiber through spinning technology.

[0038] Embodiment 1

[0039] Figure 1 A schematic flow chart of a method for preparing a strong structural cotton yarn provided by an exemplary embodiment of the present application is shown, and the method comprises the following steps:

[0040] Step S1, obtaining a natural cotton yarn sample, wherein the natural cotton yarn sample has a central cavity structure, and the central cavity structure extends along the axial direction of the natural cotton yarn sample.

[0041] In detail, natural cotton yarn samples are composed of several cotton fibers, see Figure 2 Each cotton fiber has a central cavity structure 1, a secondary layer 2, a primary layer 3 and a pectin wax layer 4.

[0042] Optionally, the raw material of the natural cotton yarn sample includes but is not limited to one of Xinjiang long-staple cotton, Egyptian cotton, Sea Island cotton, and Upland cotton.

[0043] Optionally, the spinning methods of the natural cotton yarn include but are not limited to ring spinning, vortex spinning, compact spinning, solvent spinning, siro spinning and compact siro spinning.

[0044] Step S2, immersing the natural cotton yarn sample in a glass container containing an alkaline solution to remove impurities in the natural cotton yarn sample to obtain a treated cotton yarn sample, wherein the treated cotton yarn sample retains the central cavity structure of the natural cotton yarn sample.

[0045] In the embodiment of the present application, the impurities in the natural cotton yarn sample refer to impurity components such as soluble sugars, wax, protein, fat, ash, etc.

[0046] Optionally, the natural cotton yarn sample is immersed in a glass container containing an alkali solution for 10-100 seconds.

[0047] Optionally, the alkaline solution includes at least one or more combinations of sodium hydroxide and sodium sulfite.

[0048] Step S3, immersing the treated cotton yarn sample in a glass container filled with deionized water to remove the residual alkaline solution in the treated cotton yarn sample and the impurities that were not removed in step S2, thereby obtaining a washed cotton yarn sample.

[0049] Optionally, the treated cotton yarn sample is immersed in a glass container filled with deionized water for 2-6 times.

[0050] Step S4, drying the washed cotton yarn sample to obtain a dried cotton yarn sample.

[0051] Optionally, the drying temperature of the washed cotton yarn sample is 60-150°C.

[0052] Step S5, hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample to collapse the central cavity structure of the dried cotton yarn sample to obtain a strong and tough structure cotton yarn.

[0053] In an embodiment of the present application, the dried cotton yarn sample is heat-pressed along the radial direction of the dried cotton yarn sample, including: flat heat-pressing or uniform heat-pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample.

[0054] Preferably, using Figure 3 The uniform heat pressing effect shown is better, and the instrument used in the heat pressing process is a movable heat press machine, which is divided into two parts. The upper layer is a non-movable heat pressing plate, and the lower layer is a translatable heat pressing plate. During operation, the dried cotton yarn sample 5 is placed between the first heat pressing plate 6 and the second heat pressing plate 7. While the first heat pressing plate 6 and the second heat pressing plate 7 are heat pressing the dried cotton yarn sample 5, the second heat pressing plate 7 will translate relative to the first heat pressing plate 6, so that the dried cotton yarn sample 5 is uniformly stressed in all directions during heat pressing. It should be noted that the translation direction of the second heat pressing plate 7 is perpendicular to the axial direction of the dried cotton yarn sample 5.

[0055] Flat hot pressing, that is, the first hot pressing plate 6 vertically downwardly hot presses the dried cotton yarn sample 5 placed on the second hot pressing plate 7. The schematic diagram of the strong and tough structure cotton yarn obtained after flat hot pressing and uniform hot pressing is as shown in FIG. Figure 4 As shown, it can be seen that the lumen structures 1 of several cotton fibers in the strong structural cotton yarn 5 are all collapsed, and there are no gaps between the cell walls of the lumen structures 1.

[0056] Optionally, the hot pressing temperature when hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample is 20-120°C.

[0057] Optionally, the pressure applied when the dried cotton yarn sample is hot-pressed along the radial direction of the dried cotton yarn sample is 0.5-10 MPa.

[0058] In addition, the present application also provides a braided wire, which is braided using the strong and tough structural cotton yarn prepared by the above method for preparing the strong and tough structural cotton yarn, and includes:

[0059] A plurality of strong structural cotton yarns are wound around the spindle of a braiding machine and then woven.

[0060] Optionally, when a plurality of strong structural cotton yarns are wound around a spindle of a braiding machine and then braided, the braiding pitch is 1-9 mm, the braiding speed is 10-150 rpm, and the braided spring diameter is 0.6-0.8 mm.

[0061] Optionally, the number of spindles of the knitting machine includes but is not limited to 8 spindles, 12 spindles or 16 spindles.

[0062] In summary, the present application uses chemical treatment to remove impurity components such as soluble sugars, wax, protein, fat, ash, etc. in natural cotton yarn. The treated cotton yarn retains the lumen structure of natural cotton yarn, wherein the cellulose nanofibers of the cell wall are arranged neatly, and the lumen structure of the cotton yarn collapses after being treated by hot pressing technology. At this time, the cell walls are staggered together, and hydrogen bonds are formed between adjacent cellulose nanofibers, thereby achieving the improvement of the mechanical properties of the cotton yarn on the basis of not blending with other chemical fibers, and retaining the original advantages of the cotton yarn. Moreover, the braided wire woven from the strong and tough structure cotton yarn can be completed on a braiding machine, the process adjustment is convenient, and the product thickness and length are highly adjustable. In addition, the present application is only chemically treated in the early stage, and the chemical substances used are safe and non-toxic, and the whole process is safe and environmentally friendly.

[0063] In order to better understand the present application, three specific embodiments are provided below to further illustrate the present application. It should be noted that the embodiments described in the specific embodiments are only part of the embodiments of the present application and do not limit the scope of protection of the present application.

[0064] Embodiment 2

[0065] A method for preparing strong structural cotton yarn, comprising:

[0066] Step S1, obtaining a natural cotton yarn sample;

[0067] Step S2, treating the natural cotton yarn sample with 5 wt % sodium hydroxide, immersing the natural cotton yarn sample in a glass container containing sodium hydroxide for 30 seconds to remove impurities in the natural cotton yarn sample, and obtaining a treated cotton yarn sample;

[0068] Step S3, washing the treated cotton yarn sample three times with deionized water to remove the residual alkaline solution in the treated cotton yarn sample and the impurities not cleaned up in step S2, to obtain a washed cotton yarn sample;

[0069] Step S4, drying the washed cotton yarn sample at a temperature of 100° C. for 12 h to obtain a dried cotton yarn sample;

[0070] Step S5, subjecting the dried cotton yarn sample to flat hot pressing or uniform hot pressing treatment, the pressure applied during hot pressing is 5 MPa, the hot pressing temperature is 100° C., and the hot pressing time is 4 hours, to obtain a strong and tough structured cotton yarn.

[0071] Step S6, winding the strong structural cotton yarn on the spindle of the braiding machine and then braiding it, the braiding pitch is set to 4.63 mm, and a 0.7 mm spring is used to control the yarn tension during braiding.

[0072] Effect description:

[0073] In this embodiment, the diameter of the braided wire sample obtained after braiding is 1mm and the overall length is 2000mm. Due to the low alkali concentration, this implementation scheme cannot remove most of the impurities and completely destroy the cell wall structure during the treatment process, so it cannot achieve a good reinforcement effect. After testing, the breaking strength of the cotton yarn braided wire without any treatment is 82.36N, and the elongation at break is 30.42%; the breaking strength of the cotton yarn braided wire obtained after the above implementation scheme is 73.59N, and the elongation at break is 27.82%.

[0074] Embodiment 3

[0075] A method for preparing strong structural cotton yarn, comprising:

[0076] Step S1, obtaining a natural cotton yarn sample;

[0077] Step S2, treating the natural cotton yarn sample with 50 wt % sodium hydroxide, immersing the natural cotton yarn sample in a glass container containing sodium hydroxide for 60 seconds to remove impurities in the natural cotton yarn sample, and obtaining a treated cotton yarn sample;

[0078] Step S3, washing the treated cotton yarn sample 5 times with deionized water to remove the residual alkaline solution in the treated cotton yarn sample and the impurities not cleaned in step S2, to obtain a washed cotton yarn sample;

[0079] Step S4, drying the washed cotton yarn sample at a temperature of 100° C. for 12 h to obtain a dried cotton yarn sample;

[0080] Step S5, subjecting the dried cotton yarn sample to flat hot pressing or uniform hot pressing treatment, the pressure applied during hot pressing is 10 MPa, the hot pressing temperature is 100° C., and the hot pressing time is 24 h, to obtain a strong and tough structured cotton yarn.

[0081] Step S6, winding the strong structural cotton yarn on the spindle of the braiding machine and then braiding it, the braiding pitch is set to 4.63 mm, and a 0.7 mm spring is used to control the yarn tension during braiding.

[0082] Effect description:

[0083] In this embodiment, the diameter of the braided wire sample obtained after braiding is 1mm and the overall length is 2000mm. Due to the high alkali concentration and the long hot pressing pressure and time, the cotton yarn is severely damaged, which results in the final cotton yarn not being able to achieve a good reinforcement effect. After testing, the breaking strength of the cotton yarn braided wire without any treatment is 82.36N, and the elongation at break is 30.42%; the breaking strength of the cotton yarn braided wire obtained after the above implementation scheme is 48.40N, and the elongation at break is 21.09%.

[0084] Embodiment 4

[0085] A method for preparing strong structural cotton yarn, comprising:

[0086] Step S1, obtaining a natural cotton yarn sample;

[0087] Step S2, treating the natural cotton yarn sample with 25 wt % sodium hydroxide, immersing the natural cotton yarn sample in a glass container containing sodium hydroxide for 30 seconds to remove impurities in the natural cotton yarn sample, and obtaining a treated cotton yarn sample;

[0088] Step S3, washing the treated cotton yarn sample 5 times with deionized water to remove the residual alkaline solution in the treated cotton yarn sample and the impurities not cleaned in step S2, to obtain a washed cotton yarn sample;

[0089] Step S4, drying the washed cotton yarn sample at a temperature of 100° C. for 12 h to obtain a dried cotton yarn sample;

[0090] Step S5, subjecting the dried cotton yarn sample to flat hot pressing or uniform hot pressing treatment, the pressure applied during hot pressing is 5 MPa, the hot pressing temperature is 100° C., and the hot pressing time is 12 h, to obtain a strong and tough structured cotton yarn.

[0091] Step S6, winding the strong structural cotton yarn on the spindle of the braiding machine and then braiding it, the braiding pitch is set to 4.63 mm, and a 0.7 mm spring is used to control the yarn tension during braiding.

[0092] Effect description:

[0093] In this embodiment, the diameter of the braided wire sample obtained after weaving is 1mm and the overall length is 2000mm. This implementation scheme is more suitable because the alkali concentration, hot pressing pressure and time are more suitable. While removing cotton yarn impurities, the structure of cotton fibers is retained. After hot pressing treatment, the obtained cotton yarn has a better improvement. After testing, the breaking strength of the cotton yarn braided wire without any treatment is 82.36N, and the elongation at break is 30.42%; the breaking strength of the cotton yarn braided wire obtained after the above implementation scheme is 125.68N, and the elongation at break is 22.97%.

[0094] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for preparing strong structural cotton yarn, characterized in that: include: S1. Obtain a natural cotton yarn sample, wherein the natural cotton yarn sample has a central cavity structure, and the central cavity structure extends along the axial direction of the natural cotton yarn sample; S2, immersing the natural cotton yarn sample in a glass container containing an alkaline solution to remove impurities in the natural cotton yarn sample to obtain a treated cotton yarn sample, wherein the treated cotton yarn sample retains the central cavity structure of the natural cotton yarn sample; S3, immersing the treated cotton yarn sample in a glass container filled with deionized water to remove the residual alkaline solution in the treated cotton yarn sample and the impurities that were not removed in step S2, to obtain a washed cotton yarn sample; S4, drying the washed cotton yarn sample to obtain a dried cotton yarn sample; S5, hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample to collapse the central cavity structure of the dried cotton yarn sample to obtain a strong and tough structural cotton yarn; In step S5, the hot pressing temperature is 100-120° C. and the applied pressure is 5-10 MPa.

2. The method for preparing the strong structural cotton yarn according to claim 1, characterized in that: In step S2, the alkaline solution includes at least one or a combination of sodium hydroxide and sodium sulfite.

3. The method for preparing the strong structural cotton yarn according to claim 2, characterized in that: The alkaline solution is a sodium hydroxide solution.

4. The method for preparing the strong structural cotton yarn according to claim 1, characterized in that: In step S1, the raw material of the natural cotton yarn sample includes at least one of Xinjiang long-staple cotton, Egyptian cotton, Sea Island cotton, and Upland cotton.

5. The method for preparing the strong structural cotton yarn according to claim 1, characterized in that: In the step S5, the step of hot pressing the dried cotton yarn sample along the radial direction of the dried cotton yarn sample comprises: The dried cotton yarn sample is subjected to flat heat pressing or uniform heat pressing along the radial direction of the dried cotton yarn sample.

6. The method for preparing the strong structural cotton yarn according to claim 1, characterized in that: In the step S2, the natural cotton yarn sample is immersed in the glass container containing the alkaline solution for 10-100 seconds.

7. The method for preparing the strong structural cotton yarn according to claim 1, characterized in that: In the step S4, the drying temperature for drying the washed cotton yarn sample is 60-150°C.

8. A braided wire, the braided wire is braided with the strong and tough structure cotton yarn prepared by the method for preparing the strong and tough structure cotton yarn according to any one of claims 1 to 7, characterized in that: include: A plurality of the strong structural cotton yarns are wound on a spindle of a braiding machine and then braided.

9. The method for preparing the braided wire according to claim 8, characterized in that: When a plurality of the strong structural cotton yarns are wound around the spindle of a braiding machine and then braided, the braiding pitch is 1-9 mm, the braiding speed is 10-150 rpm, and the braiding spring diameter is 0.6-0.8 mm.

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